Filter



N. W. GLASS Feb. 4, 1941.

FILTER Filed Jan. 5l, 1958 Patented Feb. 41, 1941 TENT OFFICE 1 Claim.

The invention relates to lters adapted for iiltering oil and other liquids.

The object of the invention is to provide a simple and efficient filter in which the ltering element and the discharge conduit are combined so that it is removable as a unit from the device for replacement or cleaning.

Another object is to provide a filter in which all the liquid is compelled to travel through the filtering medium in its passage through the device. i

The invention is illustrated in the accompanying drawing, in which- Figure 1 is an elevation of the device partly broken away.

Fig. 2 is a vertical cross-section of the filtering unit and Fig. 3 is a transverse cross-section of the unit, the filteringmedium being omitted.

Referring to the illustrative drawing, I is a casing having an admissionport 2 in its side wall and an opening 3 in its bottom. An internally threaded fitting 4 is secured to said bottom wall about the opening 3 and receives in its lower por- 26 tion the discharge pipe of the system into which the device is connected. The admission pipe of the system is connected to the casing at the port 2. A drain opening in the bottom of the container is normally closed by the plug 5. A cover 6 closes the open top of the container, a gasket l being disposed between the cover and the upper edge of the container.

The filtering unit comprises a preferably annular container 8 having its side wall 9 perforated throughout the perforations I 0 being relatively small. There may be as many as 100 perforations to one square inch of area of said wall.k A perforated tube II extends centrally through the container 8 and it is secured to the bottom I2 by 40 the lock nuts I3 and to the top closure I4 by the lock nuts I5, which nuts are threaded on the tube. The lower threaded end of the tube that projects below the bottom I2 of the container threads into the upper portion of the outlet fit- 4 ting that is above the bottom of the casing i.

The threaded upper end of the tube extends through an opening in the cover 6 and a cap nut I6, a. gasket I'l being between it and the cover,

serves to clamp the cover 6 on the casing and lock the unit in the casing. Any form of openings I8 may be provided in the tube I I.

A perforated annular partition I9, such as a wire screen, is xed within the container or cartridge 8 at a suitable distance from the side wall 9, and forms two compartments 2B, 2| in the container. A relatively coarse filtering agent 22 fills the compartment 20 and a relatively iine filtering agent fills the compartment 2|. Any suitable form of ltering medium may be used. The par- 5 tition I9 may be omitted if desirable, for some uses of the filter.

The liquid entering the device at the inlet port 2 travels both upwardly and downwardly in the outer chamber or space 23 between the casing 10 and the filter unit, maintaining a constant pressure on the wall 9 of the container or cartridge 8 throughout its circumference. The liquid thence passes through the perforated wall of the container into and through the outer coarse 15 filtering medium, then through the partition I9 into and through the inner fine ltering medium and then into the tube through the openings therein, through which tube the filtered liquid flows to the discharge outlet of the device.

The filtering media remove all foreign solid matter from the liquid and any such matter that settles in the outer chamber 23 collects in the space 24 below the ltering unit and may be withdrawn by removing the plug 5, The itting 4 25 prevents the sediment in the space 24 from passing into the outlet when the filtering unit is removed.

Since the container or cartridge 8 is connected to the tube H the withdrawal of the unit is ieadily accomplished by removing the cap nut I6 and the cover Ii and then rotating the unit to disconnect the tube from the outlet tting 4. The unit is then easily lifted out of the casing for cleaning or it may be replaced by a new unit.

What I claim is:

A filtering device comprising a cylindrical outer casing having a side wall provided with an inlet opening and a bottom provided with a centrally disposed outle-t opening, an internally threaded hollow socket member fixed on said bottom in axial alinement with the opening therein and projecting upwardly from the bottom, a removable top for said casing having a depending ange fitting on the upper end of the casing, said top having a centrally disposed opening therein, a perforated pipe extending downwardly through the opening in the top and having its lower end screwed into said socket, a disk-like filter head having a central opening receiving the lower end of the pipe, nuts screwed onto said pipe above and below the head and securing the head on the pipe, an upstanding peripheral flange on said head, a second similar filter head on the upper plate, a nut screwed on the upper part of the pipe and bearing on the second head to clamp the perforated plates between the heads, ltering material between the perforated plates and between the pipe and second plate to hold the latter in concentric position, and a cap closing the upper t end of said pipe and holding said cover closed.

NED W. GLASS. Y 

